| 单词 |
polysomatic |
| 释义 |
polysomatic, a.|ˌpɒlɪsəʊˈmætɪk|
[f. Gr. πολυσώµατ-ος with many bodies: see -ic.]
1. Petrol. [ad. G. polysomatisch (G. Tschermak Die mikrosk. Beschaffenheit der Meteoriten (1885) i. 12).] Consisting of more than one grain or more than one mineral.
1888Amer. Geologist I. 201 The boundaries between the different members of these ‘polysomatic’ masses of augite are traceable only with difficulty. 1910Mineral. Mag. XV. 356 The commonest are polysomatic olivine chondrules with either granular or porphyritic structure. 1920Proc. Nat. Acad. Sci. VI. 455 The porphyritic forms [of chondrule]..pass gradually into those which are almost or quite holocrystalline and polysomatic. 1973G. J. H. McCall Meteorites & their Origins xv. 191 Polysomatic chondrules may consist of numerous grains of a single mineral..or of more than one mineral species.
2. Biol. [ad. G. polysomatisch (O. F. I. Langlet 1927, in Svensk Bot. Tidskr. XXI. 3).] Of, pertaining to, or exhibiting polysomaty.
1937Cytologia VIII. 270 Although the possibility exists that polysomatic cells may arise in a number of different ways, there is evidence, if we can consider as significant the paired condition of polysomatic metaphase chromosomes, that the process involving two successive cleavages of the chromosomes is more widespread in plants than heretofore supposed. 1948Nature 17 Jan. 80/2 These first studies..indicated that a very large proportion of differentiated cells behind the meristematic region are polysomatic. 1969Brown & Bertke Textbk. Cytol. xxiii. 538/1 Examples of the second category, replication, are differentiating cells that produce polytene and/or polysomatic nuclei..[etc.]. |
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